All Questions

1
vote
1answer
25 views

Question on how to identify (incorrectly tagged) bicycle routes from OSM

My workmates and I are trying to use OSM data about bicycle routes and other touristic infrastructure for the assessment of cultural ecosystem services. First, we compared the OSM data to official ...
0
votes
1answer
23 views

Converting CSV with LineString into shapefile using ArcGIS Desktop?

I have a CSV which I've imported into ArcGIS Desktop, and it contains a Linestring column. How do I convert it into a shapefile? Example of what one of the fields contain below: [[51.53878768021,...
1
vote
2answers
29 views

Reduce complexity of KML file

I have a 6mb KML file I am using with the Leaflet API/Ominvore plugin. It is just a centerline of a long distance trail. What would be the best way to make it smaller? Reduce complexity etc.
0
votes
0answers
20 views

Using Compressed Data Files (.cdf) from a Geodatabase in QGIS?

I am using QGIS3 for a file geodatabase that was created on ArcMap. I can only access a few of the layers in the QGIS browser because most of them are stored using a compressed data file (.cdf). When ...
1
vote
1answer
19 views

ETOPO1 upsampling issue

I am using the OSGeo4W Shell with the ETOPO1, 1 arc-minute global bathymetric data (etopo1_ice_g_f4.flt). I am cutting 256x256 pixel slippy map tiles, and am having a problem with getting smooth-...
2
votes
1answer
46 views

ST_Transform not working locally

I am using PostgreSQL 9.6 and PostGIS extension 2.4.4. On my machine, I get an error while running ST_Transform query: SELECT ST_Transform(ST_SetSRID(ST_MakePoint('27.9252', '-26.0987'),4326),32619) ...
0
votes
0answers
16 views

NHGIS census files get lat/lon from polygon

I've never worked with shapefiles before and I'm having a lot of trouble with something that I think should be pretty simple. So I have the census tract files from NHGIS for 1980 and the structure ...
0
votes
2answers
39 views

Getting hightest and lowest points

I have GeoJSON files that contains altitude values. I have used these GeoJSON files to be shown on leaflet.js web map. I need to show values of highest and lowest point in two divs when I clicking on ...
1
vote
1answer
21 views

Choosing method for labeling graduated data that is space efficient? [on hold]

Could someone recommend the best standard approach to labeling graduated data ranges? I was thinking of the following but would like to know if this is industry standard: Less than 0 >0 - 100 &...
-3
votes
0answers
11 views

Discrete Global Grid Systems : implementation examples? [on hold]

As part of a Discrete Global Grid Systems (DGGS) ‘s state of art, I have to analyse some land and marine oceanographic use cases. That’s why I venture to write to you and ask following questions. ...
2
votes
1answer
18 views

What is the difference between .filterMetadata(), ee.Filter.lte() and .sort() in google earth engine?

I am currently trying to obtain images that have less than 70% cloud cover (for example) and I have come across multiple variations of the same. Could you tell me what is the difference between these ...
0
votes
1answer
13 views

Ordering symbols in GeoServer using SLD with rendering transformations

I have been following this post-Is there a symbols level option/solution for SLD? about stacking symbols but I have been stuck in using <FeatureTypeStyle> with GeoServer rendering ...
1
vote
3answers
50 views

Perfect circle buffer on QGIS Madeira 3.4

Working on a road junction I would like to make a perfect rounded circle buffer of 1 km around this junction in QGIS 3.4. Here is what is look like now.
3
votes
1answer
84 views

Custom function works in “Zoom to Features” but not “Select Features”

I'm trying to update the Using Custom Functions tutorial to QGis 3 and Python 3 and I've run into an interesting issue. With the following code I can create an expression GetUtmZone()='33N' and it ...
1
vote
1answer
21 views

QGIS 3: How to rename attribute/field names for Geopackage Layer

Issue: I need to rename several attributes/fields in a geopackage layer. How to do this? Linked Issue: there are numerous pages on how to rename the attributes/fields of a shapefile. However there do ...
1
vote
0answers
12 views

Using GRASS in Python script QGIS 3

I am creating a Python script in QGIS 3 and I want to use the processing module. I want to transform my raster file to a vector file with the GRASS algorithm r.to.vect. My problem here is that the ...
0
votes
1answer
20 views

How do I add a georeferenced JPEG with a JGW Worldfile to OpenLayers v5.3.0?

I have a JPEG file with an associated .JGW worldfile containing the following data: 0.0144218 0 0 -0.0144218 -65758.8265181 -130841.5565499 My Jpeg is 21177*14242 pixels resolution. I'm currently ...
1
vote
1answer
20 views

Naming exported features from attribute information?

I am new to Python and in the process of learning. As a self test I am trying to export all of the municipalities of a single county feature layer as their own feature layers. I am trying to name each ...
1
vote
1answer
22 views

CORS issue loading an external local GeoJSON into OpenLlayers 5

I have a local folder on my network with my HTML file and two subfolders, one with the downloaded folder from OpenLayers (renamed ol) and the other with my GeoJSON file (data). When I try to load the ...
0
votes
0answers
14 views

How do I get TIFF asset of historical images to my drive?

I have loaded Landsat 4 TOA images. I added a table for my region of interest then I clipped it. Now I want to export the clipped image to my drive. But this error is shown in the task bar whenever I ...
0
votes
2answers
17 views

GeoServer SLD subquery in WHERE clause

I have this SQL request select name from osm_places where name in (select capital_city from osm_places where capital_city != '') Is it possible to write such a request in < ogc:Filter> section? ...
1
vote
0answers
22 views

ArcPy progessor not progressing?

I have a script too that works fine, but the progressor is not counting up at all (staying at "0%") when I run my tool, even though I can confirm it is working - I can see the products of the script ...
-1
votes
0answers
14 views

Same layer with multiple user-defined styles [on hold]

I am considering using GeoServer with OpenLayers and I would like to understand if the following is possible. I have a PostGIS table with features that I would like to turn into a geoserver layer. ...
0
votes
1answer
55 views

Plugin processAlgorithm. Same code, different results in script vs plugin code

I'm adding functionality to a QGIS Plugin to create a print layout and add stuff to it like a map, legend, etc. To test this code, I wrote a script. The script works and creates the print layout the ...
0
votes
1answer
18 views

ArcMap / ArcObjects - Type “OLEDBWorkspaceFactory” is not defined when creating a new workspace

Making an Add-In for ArcMap, refactoring old VBA code into VB.NET. Trying to create a new workspace with ArcObjects in VB.NET. I am getting the error: BC30002 Type "OLEDBWorkspaceFactory" is not ...
2
votes
2answers
26 views

How to rename duplicated layers in QGIS3?

I duplicated a layer ("Buildings") in QGIS 3.4.4 and with the Query Builder under Source I selected to just display schools. Subsequently I renamed this layer "Schools" by rightclicking on the layer, ...
-2
votes
0answers
26 views

Mutiple markers per single lat, long and curving polylines

1) I am plotting transfers from Facility A to Hospital. As such most the facilities have multiple transfers to different hospitals and different hospitals receive transfers from many facilities ...
0
votes
0answers
12 views

OpenLayers. External ArcGISCache layer has different zoom levels/scales than current map in use

Current map has 40 zoom levels. Map uses mostly internal layers but for this one special layer an external service is used and that is where ArcGISCache comes in. This ArcGISCache layer has its layer ...
0
votes
1answer
24 views

ArcGIS: How to use Attribute Values in Rasters?

I have 4 Shapefiles which basicly have 7 important fields and are basicly looking like: ------------------------------------------------------------------ | Name | Connection 1 | Con 2 | Con 3 | ...
0
votes
1answer
26 views

Create a 5x5 km polygon grid by sub-setting a 10x10km one

I have a 10x10km grid in Lambert Conformal Conical projection (consider it as a sample frame). I want to create another grid 5x5km by splitting in 4 parts each one of the original grid cells (the ...
0
votes
1answer
28 views

Uploading TAB data to MSSQL using ogr2ogr

I have been trying various methods to import a shapefile into MSSQL but keep getting FAILURE: no source datasource provided. ATTEMPTS ogr2ogr -f "MSSQL:Server=xxx;Database=_GIS_Test;UID=yyy;PWD=...
0
votes
2answers
19 views

Updating legend (when active layer is changed) in CARTO VL?

I have made a CARTO VL map that allows the user to update the active layer depending on which groundwater aquifer option is selected. The layers have different Sources, but use the same Viz. For ...
0
votes
0answers
6 views

Linking WMS to Google Earth with API key [on hold]

nmtoken explained very well in Linking Geoserver WMS layer to Google Earth? how to link WMS layer to Google Earth but I have a question regarding when my WMS source has an API key. Can I specify the ...
0
votes
1answer
35 views

Integrate JSON file inputs (specifically latlng) in Leaflet with JS

It's my first time using Leaflet and I wanted to simply put two markers based from my inputs. I managed to connect my JSON file with the JavaScript and the only problem I have is how to dynamically ...
2
votes
1answer
222 views

Why are Shapefiles limited to 2GB in size? [on hold]

I'm hoping somebody can clarify for me why .shp are limited to a 2GB file size? Having read through the ESRI considerations and technical description, I cannot understand why it exists. Since they ...
0
votes
3answers
36 views

Filtering interactive leaflet-map with dropdown-menu?

I try to set up a filterable "shot chart" like http://graphics.latimes.com/kobe-every-shot-ever/ with leaflet. I've a geojson file thats stores all the shots data, I've them showing up in a layer. ...
1
vote
0answers
10 views

QGIS 3.4 and loading raster from multiple variable NetCDF file

Using QGIS version 3.4.4 when loading a NetCDF file out.nc which contains multiple variables on a fresh Ubuntu 18.04 install I encounter the following error: CRITICAL Invalid Layer : Raster layer ...
0
votes
0answers
4 views

Creating CoverageStore using REST API from GeoTIFF already in GeoServer DATA_DIR

I have a GeoTIFF already available in GeoServer DATA_DIR, specifically in a subdir named "rice" and I woluld like to publish it as a CoverageStore. What I could understand is that REST API allows to ...
0
votes
1answer
37 views

Land Cover Change Classification in R

I have two Land Cover (LC) classification raster over the same area and the same cell size. One from the year 2018 and the other from the year 2014. Both raster are classified with the values 1 - 6, ...
0
votes
1answer
21 views

Leaflet: how to select a feature by property

I have a geojson layer with continents info (got it from here), and I want to select a feature(continent) based on its name value or "CONTINENT" in this case. I did some research and ended up with ...
0
votes
1answer
36 views

Draw a polygon with specified edge length in QGIS Madeira

I am looking for a possibiliy to draw a polygon with specified edge length in QGIS Madeira. I already checked further Threads belonging to this question, but all answers refer to PlugIns which are not ...
0
votes
1answer
20 views

BufferUnderflowException in GeoServer when trying to render from one specific shapefile

I am using GeoServer, I uploaded multiple shapefiles onto GeoServer data folder and created Datastores followed by Layers in the GeoServer Dashboard. Out of the 33 shapefiles I used, 30 are rendering ...
0
votes
1answer
47 views

Calculating delaunay triangulation with two diagonal lines using ArcGIS Desktop?

How do I obtain a line output similar to a delaunay triangulation but with two diagonal lines, from a point layer containing a regular-spaced point grid using ArcGIS Desktop? The current result is ...
2
votes
0answers
45 views

Merging sections of lines with same geometry in QGIS? [duplicate]

I have a series of bus routes with the frequency/hour attached in QGIS. The idea is to combine the frequencies on routes with more than one bus to have an overall bus frequency for the sections of ...
-1
votes
0answers
15 views

Establishing interactive communication between ArcMap and CityEngine? [on hold]

I want to make and draw a shapefile (consists a building plan) in ArcMap and import this to CityEngine automatically by using a customize UI. How is it done??
-2
votes
0answers
13 views

Web_gl Leaflet canvas [on hold]

I have almost no experience in web-gl but I am trying to create a Leaflet canvas scalar Field something likes this "https://ihcantabria.github.io/Leaflet.CanvasLayer.Field/...
0
votes
0answers
18 views

How to select max and min values of NDVI of a particular plant species and make a Chart in Earth Engine?

I am trying to calculate NDVI of a region and trying to make NDVI chart of it. I got results for that work. I am facing a challenge to extract the NDVI values of particular species(eg:wheat) within a ...
0
votes
1answer
34 views

Font size in DXF export QGIS

I am trying to export our Property layer to DXF but am running into issues with labels. I have tried each of the three ways that I have seen described about DXF export, and none of them work for me. ...
0
votes
0answers
12 views

How to configure S3 datastore with s3-geotiff in GeoServer?

I have successfully setup GeoServer and S3 server (with minio), and also installed s3-geotiff module, but I can't access an S3 file hosted by minio server. When adding a "S3Geotiff" data source, I put ...
0
votes
0answers
12 views

Initiating Edit Session when opening Python Toolbox?

I initially posted a question regarding the use of the GpFeatureRecordSetLayer Parameter in a Python Toolbox I am creating. Original Question: Using GPFeatureRecordSetLayer in Python Toolbox for ...

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